Sink



FIG. 1 is a top plan view of a sink showing our new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof; and

FIG. 7 is a perspective view taken from the top and front thereof. 

The ornamental design(s) for the sink, substantially as shown. 